/* packet-rfid-mifare.c * Dissector for the NXP MiFare Protocol * * References: * http://code.google.com/p/nfc-tools/source/browse/trunk/libfreefare/libfreefare/mifare_classic.c * http://www.nxp.com/documents/data_sheet/MF1S703x.pdf * http://www.nxp.com/documents/application_note/AN1304.pdf * * Copyright 2011, Tyson Key * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * */ #include "config.h" #include void proto_register_mifare(void); void proto_reg_handoff_mifare(void); static int proto_mifare = -1; static int hf_mifare_command = -1; static int hf_mifare_block_address = -1; static int hf_mifare_key_a = -1; static int hf_mifare_key_b = -1; static int hf_mifare_uid = -1; static int hf_mifare_operand = -1; static int hf_mifare_payload = -1; #define AUTH_A 0x60 #define AUTH_B 0x61 #define READ 0x30 #define WRITE 0xA0 #define TRANSFER 0xB0 #define DECREMENT 0xC0 #define INCREMENT 0xC1 #define RESTORE 0xC2 static const value_string hf_mifare_commands[] = { {AUTH_A, "AUTH_A"}, {AUTH_B, "AUTH_B"}, {READ, "READ"}, {WRITE, "WRITE"}, {TRANSFER, "TRANSFER"}, {DECREMENT, "DECREMENT"}, {INCREMENT, "INCREMENT"}, {RESTORE, "RESTORE"}, /* End of commands */ {0x00, NULL} }; /* Subtree handles: set by register_subtree_array */ static gint ett_mifare = -1; static int dissect_mifare(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_item *item; proto_tree *mifare_tree; guint8 cmd; col_set_str(pinfo->cinfo, COL_PROTOCOL, "MiFare"); col_clear(pinfo->cinfo, COL_INFO); /* Start with a top-level item to add everything else to */ item = proto_tree_add_item(tree, proto_mifare, tvb, 0, -1, ENC_NA); mifare_tree = proto_item_add_subtree(item, ett_mifare); proto_tree_add_item(mifare_tree, hf_mifare_command, tvb, 0, 1, ENC_BIG_ENDIAN); cmd = tvb_get_guint8(tvb, 0); switch (cmd) { case AUTH_A: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_key_a, tvb, 2, 6, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Authenticate with Key A"); break; case AUTH_B: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_key_b, tvb, 2, 6, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Authenticate with Key B"); break; case READ: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Read"); break; case WRITE: col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Write"); /* LibNFC and the TouchATag-branded reader don't expose the 2-byte CRC or 4-bit NAK, as per MF1S703x, so we pretend that they don't exist. I've never seen traces with those data structures before, either... */ proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_payload, tvb, 2, -1, ENC_NA); break; case TRANSFER: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Transfer"); break; case DECREMENT: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Decrement"); break; case INCREMENT: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Increment"); break; case RESTORE: proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN); col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Restore"); break; default: col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "Unknown"); break; } return tvb_captured_length(tvb); } void proto_register_mifare(void) { static hf_register_info hf[] = { {&hf_mifare_command, { "Command", "mifare.cmd", FT_UINT8, BASE_HEX, VALS(hf_mifare_commands), 0x0, NULL, HFILL }}, {&hf_mifare_block_address, { "Block Address", "mifare.block.addr", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }}, {&hf_mifare_key_a, { "Key A", "mifare.key.a", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }}, {&hf_mifare_key_b, { "Key B", "mifare.key.b", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }}, {&hf_mifare_uid, { "UID", "mifare.uid", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, {&hf_mifare_operand, { "Operand", "mifare.operand", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, {&hf_mifare_payload, { "Payload", "mifare.payload", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }} }; static gint *ett[] = { &ett_mifare }; proto_mifare = proto_register_protocol("NXP MiFare", "MiFare", "mifare"); proto_register_field_array(proto_mifare, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("mifare", dissect_mifare, proto_mifare); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * ex: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */